Any person may adopt his spouse's child, and any person may adopt a child to whom he is related by blood or marriage. In the adoption of these children:

1. (a) no investigation or report required under the provisions of Section 20-7-1740 is required unless otherwise directed by the court;
2. (b) no accounting by the petitioner of all disbursements required under the provisions of Section 20-7-1775 is required unless the accounting is ordered by the court;
3. (c) upon good cause shown, the court may waive the requirement, pursuant to Section 20-7-1760, that the final hearing must not be held before ninety days after the filing of the adoption petition; and
4. (d) upon good cause shown, the court may waive the requirement, pursuant to Section 20-7-1695(A)(2), of the appointment of independent counsel for an indigent parent.